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Q&A

How to fire the change event for an input field?

+1
−1

I have added some input to an input field element this way:

const inputFiled = document.querySelector("#example");
inputField.value = "X";

I want to fire a change event for that field right after the input was added.

This is something I want to try after noticing that the input isn't recognized (the form won't be submitted) if added in the above way; rather, it is recognized only by typing/pasting.

How to do that?

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More context is required to understand the actual issue (4 comments)

2 answers

+2
−0

You can use the dispatchEvent method.

const inputField = document.querySelector("#example");
inputField.value = "X";
inputField.dispatchEvent(new Event('change'));

jsfiddle

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+0
−2

from the MDN,

"Depending on the kind of element being changed and the way the user interacts with the element, the change event fires at a different moment:

  • When the element is :checked (by clicking or using the keyboard) for input type="radio" and input type="checkbox";

  • When the user commits the change explicitly (e.g., by selecting a value from a select's dropdown with a mouse click, by selecting a date from a date picker for input type="date", by selecting a file in the file picker for input type="file", etc.);

  • When the element loses focus after its value was changed, but not committed (e.g., after editing the value of textarea or input type="text")."

Inserting a value into an input field with JS also allows us to simply fire another event depending on the kind of input used. For instance, inputField.blur(); triggers the unfocus event which can be used to check the contents of an input type="text"

References:

MDN input element

MDN change event

MDN blur event

MDN input event

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